EP0839402A1 - Winding element for an electrical machine - Google Patents

Winding element for an electrical machine

Info

Publication number
EP0839402A1
EP0839402A1 EP96923821A EP96923821A EP0839402A1 EP 0839402 A1 EP0839402 A1 EP 0839402A1 EP 96923821 A EP96923821 A EP 96923821A EP 96923821 A EP96923821 A EP 96923821A EP 0839402 A1 EP0839402 A1 EP 0839402A1
Authority
EP
European Patent Office
Prior art keywords
layer
winding
contact layer
winding element
separating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96923821A
Other languages
German (de)
French (fr)
Other versions
EP0839402B1 (en
Inventor
Udo Bendfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0839402A1 publication Critical patent/EP0839402A1/en
Application granted granted Critical
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Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges

Definitions

  • the invention relates to a winding element for an electrical machine, having an electrically conductive conductor arrangement for conducting an electrical current and an insulating layer which surrounds the conductor arrangement, and a protective arrangement with a separating layer surrounding the insulating layer.
  • the invention also relates to a set with a plurality of such winding elements.
  • a winding element of the type mentioned and instructions for combining such a winding element with similar winding elements to form a set, the winding elements being interconnected and forming a winding for an electrical machine, namely a turbogenerator, are evident from WO 91/01059 AI and WO 93/06646 AI.
  • the protective arrangement serves to compensate for mechanical expansions which result when the winding element is subjected to changing temperatures.
  • the protective arrangement forms an electrically shielded zone in the separating layer, which surrounds the conductor arrangement and the insulating layer and which has a strength which is significantly reduced compared to the strength of the insulating layer and the strength of the conductor arrangement.
  • each of these columns is electrically shielded; for this reason, no glow discharge can form in the gap, which could damage the winding element.
  • the electrical shielding of the separating layer is formed with electrically conductive textiles, in particular fabrics or nonwovens, which enclose the separating layer, which contains split mica sheets as active components, between them.
  • the electrically conductive textiles can be textiles made of electrically conductive fibers, in particular b pecial certain synthetic fibers be, they may also consist of electrically insulating fibers, for example fibers Glasfa ⁇ exist and further by the addition Komponen ⁇ ten, for example, electrically conductive coatings and / or carbon black, subsequently made electrically conductive wor ⁇ be the.
  • the electrically conductive contact layers enclosing these are electrically contacted with one another via bridges which run through the separating layer. These bridges are formed with a further, at least weakly conductive textile tape.
  • the separating layer itself is provided as a tape which contains split mica sheets.
  • This tape is wound on the winding element, and another, electrically conductive tape, which forms the bridges, is alternately passed over the mica tape or under the mica tape, forming the necessary bridges.
  • These bridges are those sections of the strip which come to lie between two adjacent layers of the strip containing split mica sheets and thus extend from an inner side facing the insulating layer to an outer side of the strip containing the insulating layer facing away from the insulating layer.
  • the contact layers can be applied separately from the separating layer or together with the separating layer; in particular, one of the contact layers can be a textile carrier material for the split mica sheets.
  • An important component of the insulating components of a winding element for an electrical machine is a resin preparation in which further components of the insulating components, in particular mica preparations, are embedded.
  • the mica preparations are contained in tapes which are wound onto the conductor arrangement of the winding element and subsequently have an obtained impregnation with the resin preparation.
  • the resin preparation is initially viscous and, after it has been introduced into the insulating components, is cured by introducing a certain chemical process.
  • the use of a resin preparation in the form of a mixture of an epoxy resin and an anhydride of an organic acid is common. This resin preparation is cured by initiating a specific chemical reaction which leads to a chemical binding of the anhydride to the epoxy resin and thereby becomes a solid body.
  • the impregnation and curing can take place separately for each winding element; it is also possible, and for an electrical machine of a size which is customary for electrical machines with power output or consumption up to 300 MW, it is also advantageous to connect all winding elements to the finished winding without prior impregnation and then impregnate the winding together with a winding support on which it is installed, with the resin preparation and harden the resin preparation. This process is known as the "whole drinking process".
  • winding elements can result from the fact that the application of the separating layer with the required electrically conductive bridges is relatively complicated and, as a result, generally has to be carried out by hand. In the sense of simplifying and making the necessary manufacturing process cheaper, it is therefore the object on which the invention is based, a winding element at the beginning Specify the type mentioned, which has a protective arrangement that can be applied with little effort and by machine. A corresponding set with several winding elements is also to be specified.
  • a winding element for an electrical machine with an electrically conductive conductor arrangement for conducting an electrical current and an insulating layer that surrounds the conductor arrangement, and a protective arrangement surrounding the insulating layer, which protective arrangement includes a screw-like separating layer and has a contact layer which is arranged in a screw-like and self-overlapping manner and which crosses the separating layer from an inside facing the insulating layer to an outside facing away from the insulating layer and is at least weakly conductive.
  • This winding element is characterized in that the complex bridges are no longer required.
  • the usual practice of providing a continuous three-layer structure for the protective arrangement is avoided.
  • an essentially two-layer structure of the protective arrangement is now taught, the two layers still required, namely the separating layer and the contact layer, being guided around the winding element in a screw-like manner.
  • This screw-like arrangement means that the bridges, which are expensive to manufacture, can be dispensed with, since the contact layer itself, due to its self-overlap, leads in many different ways from an inside of the separating layer to an outside of the separating layer and can therefore achieve the potential equalization necessary for electrical shielding of the separating layer.
  • bridging on the outside of the winding element in the circumferential direction can be achieved by means of a winding support. This surrounds the winding element in the circumferential direction and is contacted with it.
  • an external glow protection current can flow in a predominantly axial and not helical direction flow.
  • the separating layer For the effectiveness of the separating layer, it is not absolutely necessary that it forms a complete covering of the winding element; gaps can remain free, through which the contact layer passes from the inside to the outside of the separating layer. If necessary, the separating layer can be arranged overlapping itself and thus form a complete covering of the winding element; Corresponding further developments of the invention will be explained.
  • the contact layer preferably covers the separating layer both on the inside and on the outside, so that the separating layer is not exposed neither on its inside nor on its outside. This arrangement is particularly advantageous for achieving the equipotential bonding which is important for the function of the separating layer.
  • the contact layer is further preferably formed from at least one electrically at least weakly conductive textile tape.
  • the contact layer is likewise preferably formed from an inner contact layer attached to the inside of the separating layer and an outer contact layer attached to the outside of the separating layer, wherein respective partial areas of the inner contact layer and the outer contact layer between partial areas of the separating layer are electrically interconnected are contacted trically.
  • the partial areas can overlap each other.
  • the Contact layer formed from two parts, these two parts, namely the inner contact layer and the outer contact layer, being brought into contact with one another between adjacent regions of the separating layer and thus forming the contact layer as a unit.
  • This configuration is advantageous with regard to its manufacture, since it can be manufactured by winding a three-layer tape, consisting of the inner contact layer, the outer contact layer and the separating layer attached between them, in a screw-like manner and overlapping themselves on the insulating layer of the winding element.
  • the protective arrangement is applied to the winding element in a single operation, with geometric details, in particular the question of whether and to what extent two successive layers of the separating layer overlap one another, are of minor importance at best. Accordingly, this type of application of the protective arrangement can be carried out relatively quickly, in particular with the aid of a corresponding machine. There is no longer any need for careful control when applying the known ones
  • the inner contact layer and the outer contact layer can each be an electrically at least weakly conductive textile tape. It is also preferred to fix the separating layer between the inner contact layer and the outer contact layer and thus, as already indicated, to obtain a tape which only has to be wound onto the winding element in order to produce the protective arrangement.
  • the separating layer preferably contains mica sheets which, as already stated, have the desired tendency to form gaps.
  • the insulating layer, the separating layer and the contact layer of the winding element in such a way that that they can be impregnated, in particular in order to be able to apply a curable resin preparation.
  • a preferred embodiment of such a winding element is characterized by an impregnation with a hardened resin preparation, the contact layer still being able to be electrically contacted. In this way, the contact layer can be electrically contacted with a winding support in which the winding element is installed, which also contributes to a desirable potential equalization between the winding element and the winding support.
  • a set is specified with a plurality of winding elements, each winding element corresponding to the winding element according to the invention described above and in which the conductor arrangements are interconnected and a winding for an electrical machine, in particular one Turbo generator.
  • All insulating layers, all separating layers and all contact layers of the winding elements of the set can preferably be impregnated, and in particular they are impregnated with a curable resin preparation and this resin preparation is cured.
  • the winding elements of the set are preferably arranged in an electrically conductive winding support, each contact layer being electrically contacted with the winding support.
  • This winding support is in particular a body formed from a large number of thin, ferromagnetic sheets.
  • the sheets consist in particular of soft iron or of essentially the same magnetic properties as soft iron alloy.
  • the contacting of the winding elements with the winding carrier leads to a suppression of electrical potential differences between winding elements with one another or between a winding element and the winding carrier and thus contributes to a further improvement in the protection of the winding elements against damage from damage unwanted glow discharge or the like.
  • the sheets effect an electrical bridging between adjacent self-overlapping tracks of a winding element on the outside. This ensures that an external glow protection current can flow predominantly in the axial direction and not helically around the conductor arrangement.
  • FIG. 1 shows a part of a cross section through a winding element which is arranged in a winding support
  • Figure 2 is an external view of a winding element
  • Figure 3 and Figure 4 are schematic views of a winding element; such as Figure 5 is a schematic representation of a tape, which is preferably used in the manufacture of a winding element.
  • FIG. 1 shows a winding element which has an electrically conductive conductor arrangement 1 which is surrounded by different layers.
  • the conductor arrangement 1 is shown as a homogeneous, metallic body.
  • such a conductor arrangement 1 is less common; especially when the conductor arrangement 1 is part of a stator winding of an electrical machine, such as a turbogenerator, it is a more or less complex structure made up of a multiplicity of rod-shaped or ribbon-shaped electrical conductors, all or some of which may be hollow for the passage of a liquid or gaseous coolant.
  • Roebel rods are of particular importance in large electrical machines, in particular turbogenerators which are designed to deliver or take up an electrical power of 10 MW and above.
  • a Roebel rod is an arrangement with a large number of individual rod-shaped electrical conductors which are interwoven with one another according to certain aspects. In the present case, a representation is not used for reasons of simplification.
  • the conductor arrangement 1 is surrounded by an electrically insulating insulating layer 2.
  • This insulating layer 2 is usually formed by wrapping the conductor arrangement 1 with an impregnable insulating tape which contains a mica preparation as an important functional component.
  • the tape wound on the conductor arrangement 1 is finally impregnated with a curable resin preparation, in particular a mixture of an epoxy resin and an acid anhydride, and the resin preparation is cured.
  • a so-called glow protection arrangement can be provided between the conductor arrangement 1 and the insulating layer 2, which serves to equalize the electrical potential in the vicinity of the conductor arrangement 1. This is particularly important if the conductor arrangement 1 has a complex internal structure, in particular a Roebel rod.
  • the illustration of a glow protection arrangement has also been left out for reasons of simplification.
  • the insulating layer 2 of the winding element is surrounded by a protective arrangement 3, 4, consists of a screw-like and self-overlapping separating layer 3 and a contact layer 4, which is also screw-like and self-overlapping, and the separating layer 3 from an inner side 5 facing the insulating layer 2 crosses an outer side 6 facing away from the insulating layer 2.
  • the separating layer 3 is distinguished by a relatively low mechanical strength, so that a gap formation which begins when the winding element is subjected to mechanical expansions or shrinkages is concentrated in the separating layer 3.
  • the contact layer 4 is at least weakly electrically conductive and envelops the separating layer 3 to a certain extent, so that the separating layer 3 is electrostatically shielded.
  • the electrical conductivity of the contact layer 4 is preferably adapted to the expected loading of the winding element by alternating magnetic fields.
  • a magnetic alternating field penetrating the contact layer 4 leads to the fact that an electrical current is induced in the contact layer 4. Is the conductivity of the contact layer 4 relative high, it must be expected that this electrical current will be relatively high. Since the electric current also generates a magnetic field, the magnetic field acting on the outside of the contact layer 4 is influenced in total, which may be undesirable under certain circumstances. In addition, the electrical current may cause the contact layer 4 to heat up, which in the worst case could lead to spark erosion or thermal damage to the winding element.
  • the electrical conductivity of the contact layer 4 must therefore be selected accordingly. Under certain circumstances, a comparatively weak conductivity, as would be expected from a semiconductor according to the usual understanding, is sufficient to ensure the desired potential equalization by the contact layer 4. It can also be seen from FIG. 1 that the contact layer 4 is itself constructed in two parts. To emphasize this, the individual elements of the winding element are not shown in direct contact, but rather at a slight distance from one another. In reality, elements that are adjacent to one another are of course in close contact with one another.
  • the contact layer 4 is composed of an inner contact layer 7 arranged on the inside 5 of the separating layer 3 and an outer contact layer 8 arranged on the outside 6 of the separating layer 3.
  • the inner contact layer 7 and the outer contact layer 8 lie on top of one another between overlapping partial regions of the separating layer 3, thus come into electrical contact with one another and accordingly form the uniform contact layer 4.
  • the winding element is arranged in a winding support 9, which consists of a plurality of soft magnetic sheets 11 lying one on top of the other.
  • the winding element is arranged in a coil located in the winding carrier 9. Chen slot, together with at least one other, similar winding element.
  • the metal sheets 11 are in electrical contact in the circumferential direction with the outer side 6 of adjacent, overlapping layers of the winding element, so that an electrical bridging of a gap 12 present on the outer side 6 between the webs is ensured in the circumferential direction.
  • an external glow protection current flows in the axial direction, ie parallel to the conductor arrangement 1. Without this bridging, the external glow protection current would have to flow helically around the conductor arrangement 1 following the spirally wound winding element.
  • FIGS. 3 and 4 show schematic views of winding elements and are intended in particular to clarify that the dense winding of the winding element with the separating layer 3, which can be seen in FIGS. 1 and 2, is not necessary.
  • the arrangement of the separating layer 3 around the insulating layer 2 is essentially two-layered, except for those points where the separating layer 3 changes from a position directly on the insulating layer 2 to a position further away. Such a tight winding naturally results in particularly good contact between the inner contact layer 7 and the outer contact layer 8, but is not absolutely necessary.
  • Figure 3 essentially repeats the type of wrapping shown in Figures 1 and 2.
  • a continuous oblique line represents an edge of the separating layer 3 which can be seen on the outside of the winding element
  • a dashed line represents the edge of the separating layer 3, which is hidden under another position of the separating layer 3.
  • a bracket 10 shows from which solid line to which dashed line the band forming the separating layer 3 extends.
  • FIG. 4 shows, with the same reference numerals and meanings as FIG. 3, a type of winding of the winding element in which the separating layer 3 runs two thirds outside the winding element and only one third below another layer of the separating layer 3. According to FIG. 4, the winding element is therefore wound more loosely than according to FIGS. 1 to 3, which means a certain saving in material and may also require less care during manufacture.
  • FIG. 5 finally shows the band of inner contact layer 7, separating layer 3 and outer contact layer 8, which would be used to produce the winding elements recognizable from FIGS. 1 to 4.
  • the inner contact layer 7 and the outer contact layer 8 each consist of an electrically conductive textile tape. How such a textile tape can be made more precisely has already been explained.
  • the separating layer 3 consists essentially of split mica leaves which, as is known in the art, have relatively low mechanical strength and tend to split relatively easily. These split mica sheets are fastened, in particular glued, between the inner contact layer 7 and the outer contact layer 8.
  • This tape can be produced using relevant knowledge and can be stored as a whole, and its processing for the production of the winding element described is uncomplicated and can be processed using methods and machines which are known and available.
  • the winding element described is particularly suitable when the usual impregnation or impregnation with a curable resin preparation is to be carried out only after the winding element has been installed in a winding carrier and after the winding element has been connected to other, similar winding elements.
  • the winding elements and the winding carrier form a single monolith, so to speak however, it is exposed to certain mechanical expansions and shrinkages during its manufacture and also in the course of its intended operation, which require certain degrees of freedom to compensate for these expansions and shrinkages. These degrees of freedom must be such that their use does not entail any risk of glow discharges and the like occurring.
  • the winding element according to the invention which can be produced inexpensively and easily, is particularly suitable for this.
  • a winding element is particularly suitable for electrical machines, such as turbogenerators from an electrical power of 10 MW with a nominal voltage of over 6 KV or high-voltage motors from 2 MW electrical power at a nominal voltage of approx. 10 KV and above.

Abstract

The invention concerns a winding element for an electrical machine, in particular a turbo-generator, with an electrically conductive conductor arrangement (1) for conducting an electric current, an insulating layer (2) which surrounds the conductor arrangement (1), and a protective arrangement (3, 4) surrounding the insulating layer (2). The protective arrangement (3, 4) comprises a helically disposed partition layer (3) and a contact layer (4) which is likewise helically disposed in a self-overlapping manner and is at least slightly electrically conductive. The contact layer (4) passes through the partition layer (3) from an inner side (5) facing the insulating layer (2) to an outer side (6) remote from the insulating layer (2). The invention further concerns an assembly comprising a plurality of such winding elements whose conductor arrangements (1) are interconnected and form a winding for an electrical machine, in particular a turbo-generator.

Description

Beschreibungdescription
Wicklungselement für eine elektrische MaschineWinding element for an electrical machine
Die Erfindung betrifft ein Wicklungselement für eine elektri¬ sche Maschine, mit einer elektrisch leitfähigen Leiteranord¬ nung zur Leitung eines elektrischen Stromes und einer Iso¬ lierschicht, welche die Leiteranordnung umgibt, sowie einer die Isolierschicht umgebenden Schutzanordnung mit einer Trennschicht. Die Erfindung betrifft auch einen Satz mit meh¬ reren solcher Wicklungselemente.The invention relates to a winding element for an electrical machine, having an electrically conductive conductor arrangement for conducting an electrical current and an insulating layer which surrounds the conductor arrangement, and a protective arrangement with a separating layer surrounding the insulating layer. The invention also relates to a set with a plurality of such winding elements.
Ein Wicklungselement der genannten Art sowie Hinweise zur Kombination eines solchen Wicklungselementes mit gleicharti- gen Wicklungselementen zu einem Satz, wobei die Wicklungsele¬ mente untereinander verschaltet sind und eine Wicklung für eine elektrische Maschine, nämlich einen Turbogenerator, bil¬ den, gehen hervor aus der WO 91/01059 AI sowie der WO 93/06646 AI. Die Schutzanordnung dient bei einem solchen Wicklungselement zum Ausgleich mechanischer Dehnungen, die sich ergeben, wenn das Wicklungselement wechselnden Tempera¬ turen unterworfen wird. Die Schutzanordnung bildet in der Trennschicht eine elektrisch abgeschirmte Zone, die die Lei¬ teranordnung sowie die Isolierschicht umgibt und die eine Fe- stigkeit hat, die gegenüber einer Festigkeit der Isolier¬ schicht und einer Festigkeit der Leiteranordnung deutlich verringert ist. Wenn sich also Dehnungen ergeben, so können diese Dehnungen kompensiert werden durch Spalte, die sich in der Trennschicht bilden. Jeder dieser Spalte ist, wie gesagt, elektrisch abgeschirmt; aus diesem Grunde kann sich in dem Spalt keine Glimmentladung bilden, die das Wicklungselement beschädigen könnte. Die elektrische Abschirmung der Trenn¬ schicht ist gebildet mit elektrisch leitfähigen Textilien, insbesondere Geweben oder Vliesen, die die Trennschicht, wel- ehe als wirksame Bestandteile Spaltglimmerblätter enthält, zwischen sich einschließen. Die elektrisch leitfähigen Texti¬ lien können Textilien aus elektrisch leitfähigen Fasern, ins- besondere bestimmten Kunststoffasern sein, sie können auch aus elektrisch isolierenden Fasern, beispielsweise Glasfa¬ sern, bestehen und durch die Hinzufügung weiterer Komponen¬ ten, beispielsweise elektrisch leitfähiger Beschichtungen und/oder Ruß, nachträglich elektrisch leitfähig gemacht wor¬ den sein. Um die elektrische Abschirmung der Trennschicht zu gewährleisten, sind die diese einschließenden elektrisch leitfähigen Kontaktschichten über Brücken, die durch die Trennschicht hindurch verlaufen, miteinander elektrisch kon- taktiert. Diese Brücken sind gebildet mit einem weiteren, elektrisch zumindest schwach leitfähigen Textilband. Die Trennschicht selbst wird bereitgestellt als Band, welches Spaltglimmerblätter enthält. Diese Spaltglimmerblätter neigen zu weiterer Aufspaltung, und diese Neigung ist es, auf wel- eher die verringerte Festigkeit der Trennschicht und die Spaltbildung bei einem mechanischen Dehnungsprozeß beruht. Dieses Band wird auf das Wicklungselement gewickelt, und ein anderes, elektrisch leitfähiges Band, welches die Brücken bildet, wird abwechselnd über das Glimmerband oder unter das Glimmerband geführt, wobei es die notwendigen Brücken bildet. Diese Brücken sind diejenigen Abschnitte des Bandes, die zwi¬ schen zwei nebeneinander liegenden Lagen des Spaltglimmer¬ blätter enthaltenden Bandes zu liegen kommen und somit von einer der Isolierschicht zugewandten Innenseite zu einer der Isolierschicht abgewandten Außenseite des Spaltglimmer ent¬ haltenden Bandes reichen. Die Kontaktschichten können separat von der Trennschicht oder zusammen mit der Trennschicht auf¬ gebracht werden; insbesondere kann eine der Kontaktschichten ein textiles Trägermaterial für die Spaltglimmerblätter sein.A winding element of the type mentioned and instructions for combining such a winding element with similar winding elements to form a set, the winding elements being interconnected and forming a winding for an electrical machine, namely a turbogenerator, are evident from WO 91/01059 AI and WO 93/06646 AI. In the case of such a winding element, the protective arrangement serves to compensate for mechanical expansions which result when the winding element is subjected to changing temperatures. The protective arrangement forms an electrically shielded zone in the separating layer, which surrounds the conductor arrangement and the insulating layer and which has a strength which is significantly reduced compared to the strength of the insulating layer and the strength of the conductor arrangement. If there are strains, these strains can be compensated for by gaps that form in the separating layer. As mentioned, each of these columns is electrically shielded; for this reason, no glow discharge can form in the gap, which could damage the winding element. The electrical shielding of the separating layer is formed with electrically conductive textiles, in particular fabrics or nonwovens, which enclose the separating layer, which contains split mica sheets as active components, between them. The electrically conductive textiles can be textiles made of electrically conductive fibers, in particular b pecial certain synthetic fibers be, they may also consist of electrically insulating fibers, for example fibers Glasfa¬ exist and further by the addition Komponen¬ ten, for example, electrically conductive coatings and / or carbon black, subsequently made electrically conductive wor¬ be the. In order to ensure the electrical shielding of the separating layer, the electrically conductive contact layers enclosing these are electrically contacted with one another via bridges which run through the separating layer. These bridges are formed with a further, at least weakly conductive textile tape. The separating layer itself is provided as a tape which contains split mica sheets. These split mica sheets tend to split further, and it is this tendency that is the reason for the reduced strength of the separating layer and the gap formation during a mechanical expansion process. This tape is wound on the winding element, and another, electrically conductive tape, which forms the bridges, is alternately passed over the mica tape or under the mica tape, forming the necessary bridges. These bridges are those sections of the strip which come to lie between two adjacent layers of the strip containing split mica sheets and thus extend from an inner side facing the insulating layer to an outer side of the strip containing the insulating layer facing away from the insulating layer. The contact layers can be applied separately from the separating layer or together with the separating layer; in particular, one of the contact layers can be a textile carrier material for the split mica sheets.
Ein wichtiger Bestandteil der isolierenden Komponenten eines Wicklungselementes für eine elektrische Maschine ist eine HarzZubereitung, in die weitere Bestandteile der isolierenden Komponenten, insbesondere Glimmerzubereitungen, eingelagert sind. Gemäß üblicher Praxis sind die Glimmerzubereitungen enthalten in Bändern, die auf die Leiteranordnung des Wick¬ lungselementes aufgewickelt werden und anschließend eine Im- prägnierung mit der HarzZubereitung erhalten. Die Harzzube¬ reitung ist zunächst viskos-flüssig und wird, nachdem sie in die isolierenden Komponenten eingebracht ist, durch Einlei¬ tung eines bestimmten chemischen Prozesses ausgehärtet. Üb- lieh ist die Verwendung einer HarzZubereitung in Form eines Gemisches aus einem Epoxidharz und einem Anhydrid einer orga¬ nischen Säure. Diese HarzZubereitung wird durch Einleitung einer spezifischen chemischen Reaktion, die zu einer chemi¬ schen Bindung des Anhydrids an das Epoxidharz führt, ausge- härtet und wird dabei zu einem festen Körper. Die Imprägnie¬ rung und Aushärtung kann erfolgen für jedes Wicklungselement gesondert; es ist auch möglich, und für eine elektrische Ma¬ schine in einer Größe, wie sie für elektrische Maschinen mit Leistungsabgaben oder -aufnahmen bis 300 MW üblich ist, auch vorteilhaft, alle Wicklungselemente ohne vorherige Imprägnie¬ rung zunächst zu der fertigen Wicklung zu verschalten und an¬ schließend die Wicklung zusammen mit einem Wicklungsträger, auf dem sie installiert ist, mit der Harzzubereitung zu im¬ prägnieren und die HarzZubereitung auszuhärten. Dieses Ver- fahren ist als "Ganztränkverfahren" bekannt.An important component of the insulating components of a winding element for an electrical machine is a resin preparation in which further components of the insulating components, in particular mica preparations, are embedded. According to customary practice, the mica preparations are contained in tapes which are wound onto the conductor arrangement of the winding element and subsequently have an obtained impregnation with the resin preparation. The resin preparation is initially viscous and, after it has been introduced into the insulating components, is cured by introducing a certain chemical process. The use of a resin preparation in the form of a mixture of an epoxy resin and an anhydride of an organic acid is common. This resin preparation is cured by initiating a specific chemical reaction which leads to a chemical binding of the anhydride to the epoxy resin and thereby becomes a solid body. The impregnation and curing can take place separately for each winding element; it is also possible, and for an electrical machine of a size which is customary for electrical machines with power output or consumption up to 300 MW, it is also advantageous to connect all winding elements to the finished winding without prior impregnation and then impregnate the winding together with a winding support on which it is installed, with the resin preparation and harden the resin preparation. This process is known as the "whole drinking process".
Bandförmige Materialien, die elektrisch mehr oder weniger leitfähig sowie für Glimmschutzanordnungen an Wicklungsele¬ menten verwendbar sind, gehen hervor aus der DE-AS 1 021 062, der DE-AS 11 18 290 und der CH-PS 521 661. In keiner dieser Schriften wird jedoch hingewiesen auf die Verwendung solchen bandförmigen Materials in Zusammenhang mit einer Trenn¬ schicht, wie vorliegend erläutert.Band-shaped materials that are electrically more or less conductive and can be used for glow protection arrangements on winding elements can be found in DE-AS 1 021 062, DE-AS 11 18 290 and CH-PS 521 661. None of these documents describes however, pointed out the use of such band-shaped material in connection with a separating layer, as explained here.
Ein Nachteil an den aus der WO 91/01059 AI und der WOA disadvantage of the from WO 91/01059 AI and WO
93/06646 AI bekannten Wicklungselementen kann sich daraus er¬ geben, daß das Aufbringen der Trennschicht mit den erforder¬ lichen elektrisch leitfähigen Brücken relativ kompliziert ist und demzufolge in der Regel in Handarbeit ausgeführt werden muß. Im Sinne einer Vereinfachung und Verbilligung des not¬ wendigen Fertigungsprozesses ist es somit die der Erfindung zugrundeliegende Aufgabe, ein Wicklungselement der eingangs genannten Art anzugeben, welches eine Schutzanordnung auf¬ weist, die mit geringem Aufwand und maschinell aufgebracht werden kann. Es soll auch ein entsprechender Satz mit mehre¬ ren Wicklungselementen angegeben werden.Known winding elements can result from the fact that the application of the separating layer with the required electrically conductive bridges is relatively complicated and, as a result, generally has to be carried out by hand. In the sense of simplifying and making the necessary manufacturing process cheaper, it is therefore the object on which the invention is based, a winding element at the beginning Specify the type mentioned, which has a protective arrangement that can be applied with little effort and by machine. A corresponding set with several winding elements is also to be specified.
Zur Lösung dieser Aufgabe angegeben wird ein Wicklungselement für eine elektrische Maschine, mit einer elektrisch leitfähi¬ gen Leiteranordnung zur Leitung eines elektrischen Stromes und einer Isolierschicht, welche die Leiteranordnung umgibt, sowie einer die Isolierschicht umgebenden Schutzanordnung, welche Schutzanordnung eine schraubenartig angeordnete Trenn¬ schicht sowie eine schraubenartig und selbstüberlappend an¬ geordnete sowie die Trennschicht von einer der Isolierschicht zugewandten Innenseite zu einer der Isolierschicht abgewand- ten Außenseite durchquerende, elektrisch zumindest schwach leitfähige Kontaktschicht aufweist.To solve this problem, a winding element for an electrical machine is specified, with an electrically conductive conductor arrangement for conducting an electrical current and an insulating layer that surrounds the conductor arrangement, and a protective arrangement surrounding the insulating layer, which protective arrangement includes a screw-like separating layer and has a contact layer which is arranged in a screw-like and self-overlapping manner and which crosses the separating layer from an inside facing the insulating layer to an outside facing away from the insulating layer and is at least weakly conductive.
Dieses Wicklungselement zeichnet sich dadurch aus, daß die aufwendig herzustellenden Brücken nicht mehr erforderlich sind. Es wird Abstand genommen von der geläufigen Praxis, für die Schutzanordnung einen durchgehenden dreischichtigen Auf¬ bau vorzusehen. Demgegenüber wird nunmehr ein im wesentlichen zweischichtiger Aufbau der Schutzanordnung gelehrt, wobei die noch erforderlichen zwei Schichten, nämlich die Trennschicht und die Kontaktschicht, schraubenartig um das Wicklungsele¬ ment herumgeführt sind. Durch diese schraubenartige Anordnung kann von den aufwendig herzustellenden Brücken abgesehen wer¬ den, da die Kontaktschicht durch ihre Selbstüberlappung selbst vielfältig von einer Innenseite der Trennschicht zu einer Außenseite der Trennschicht führt und damit den zur elektrischen Abschirmung der Trennschicht notwendigen Poten¬ tialausgleich bewerkstelligen kann. Zudem ist eine Überbrük- kung an der Außenseite des Wicklungselementes in Umfangsrich¬ tung durch einen Wicklungsträger erreichbar. Dieser umgibt das Wicklungselement in Umfangsrichtung und ist mit diesem kontaktiert. Hierdurch kann ein Außenglimmschutzstrom in überwiegend axialer und nicht schraubenförmiger Richtung fließen. Es ist selbstverständlich möglich und im Rahmen ge¬ wisser Weiterbildungen auch vorteilhaft, zur Realisierung der Schutzanordnung im Sinne der Erfindung ein dreischichtiges Band, bestehend aus zwei elektrisch leitfähigen Lagen, die eine Lage aus Spaltglimmerblättern zwischen sich einschlie¬ ßen, zu verwenden; Einzelheiten hierzu werden noch erläutert.This winding element is characterized in that the complex bridges are no longer required. The usual practice of providing a continuous three-layer structure for the protective arrangement is avoided. In contrast, an essentially two-layer structure of the protective arrangement is now taught, the two layers still required, namely the separating layer and the contact layer, being guided around the winding element in a screw-like manner. This screw-like arrangement means that the bridges, which are expensive to manufacture, can be dispensed with, since the contact layer itself, due to its self-overlap, leads in many different ways from an inside of the separating layer to an outside of the separating layer and can therefore achieve the potential equalization necessary for electrical shielding of the separating layer. In addition, bridging on the outside of the winding element in the circumferential direction can be achieved by means of a winding support. This surrounds the winding element in the circumferential direction and is contacted with it. As a result, an external glow protection current can flow in a predominantly axial and not helical direction flow. It is of course possible and also advantageous in the context ge wisser developments, for realizing the S chutzanordnung the purposes of the invention, a three-layer tape, comprising two electrically conductive layers which einschlie¬ a sheet of laminated mica sheets between it SEN to use; Details of this will be explained later.
Für die Wirksamkeit der Trennschicht ist es nicht unbedingt erforderlich, daß diese eine vollständige Bedeckung des Wick¬ lungselementes bildet; es können Spalte freibleiben, durch welche die Kontaktschicht von der Innenseite zur Außenseite der Trennschicht gelangt. Die Trennschicht kann gegebenen¬ falls selbstüberlappend angeordnet werden und damit eine vollständige Bedeckung des Wicklungselementes bilden; ent¬ sprechende Weiterbildungen der Erfindung werden noch erläu¬ tert.For the effectiveness of the separating layer, it is not absolutely necessary that it forms a complete covering of the winding element; gaps can remain free, through which the contact layer passes from the inside to the outside of the separating layer. If necessary, the separating layer can be arranged overlapping itself and thus form a complete covering of the winding element; Corresponding further developments of the invention will be explained.
Bevorzugtermaßen überdeckt die Kontaktschicht die Trenn- schicht sowohl an der Innenseite als auch an der Außenseite, so daß die Trennschicht weder an ihrer Innenseite noch an ih¬ rer Außenseite freiliegt. Zur Erzielung des für die Funktion der Trennschicht bedeutsamen Potentialausgleichs ist diese Anordnung besonders vorteilhaft.The contact layer preferably covers the separating layer both on the inside and on the outside, so that the separating layer is not exposed neither on its inside nor on its outside. This arrangement is particularly advantageous for achieving the equipotential bonding which is important for the function of the separating layer.
Weiterhin bevorzugt ist die Kontaktschicht aus zumindest ei¬ nem elektrisch zumindest schwach leitfähigen Textilband ge¬ bildet.The contact layer is further preferably formed from at least one electrically at least weakly conductive textile tape.
Ebenfalls bevorzugt ist die Kontaktschicht gebildet aus einer auf der Innenseite der Trennschicht angebrachten inneren Kon¬ taktschicht und einer auf der Außenseite der Trennschicht an¬ gebrachten äußeren Kontaktschicht, wobei jeweilige Teilberei¬ che der inneren Kontaktschicht und der äußeren Kontaktschicht zwischen Teilbereichen der Trennschicht miteinander elek¬ trisch kontaktiert sind. Die Teilbereiche können einander überlappen. Im Rahmen einer εolchen Ausgestaltung ist die Kontaktschicht aus zwei Teilen gebildet, wobei diese zwei Teile, nämlich die innere Kontaktschicht und die äußere Kon¬ taktschicht, zwischen einander benachbarten Bereichen der Trennschicht miteinander in Kontakt gebracht sind und somit die Kontaktschicht als Einheit bilden. Diese Ausgestaltung ist vorteilhaft im Hinblick auf ihre Herstellung, denn sie ist herstellbar, indem ein dreischichtiges Band, bestehend aus der inneren Kontaktschicht, der äußeren Kontaktschicht und der zwischen diesen angebrachten Trennschicht, schrau- benartig und selbstüberlappend auf die Isolierschicht des Wicklungselementes aufgewickelt wird. Auf diese Weise wird die Schutzanordnung in einem einzigen Arbeitsgang auf das Wicklungselement aufgebracht, wobei es auf geometrische Ein¬ zelheiten, insbesondere die Frage, ob und bis zu welchem Grad zwei aufeinanderfolgende Lagen der Trennschicht einander überlappen, allenfalls in untergeordneter Weise ankommt. Dem¬ gemäß ist diese Art des Aufbringens der Schutzanordnung rela¬ tiv schnell, insbesondere unter Zuhilfenahme einer ent¬ sprechenden Maschine, durchführbar. Es bedarf nicht mehr der sorgfältigen Kontrolle, die beim Aufbringen der bekanntenThe contact layer is likewise preferably formed from an inner contact layer attached to the inside of the separating layer and an outer contact layer attached to the outside of the separating layer, wherein respective partial areas of the inner contact layer and the outer contact layer between partial areas of the separating layer are electrically interconnected are contacted trically. The partial areas can overlap each other. Within the scope of such a configuration, the Contact layer formed from two parts, these two parts, namely the inner contact layer and the outer contact layer, being brought into contact with one another between adjacent regions of the separating layer and thus forming the contact layer as a unit. This configuration is advantageous with regard to its manufacture, since it can be manufactured by winding a three-layer tape, consisting of the inner contact layer, the outer contact layer and the separating layer attached between them, in a screw-like manner and overlapping themselves on the insulating layer of the winding element. In this way, the protective arrangement is applied to the winding element in a single operation, with geometric details, in particular the question of whether and to what extent two successive layers of the separating layer overlap one another, are of minor importance at best. Accordingly, this type of application of the protective arrangement can be carried out relatively quickly, in particular with the aid of a corresponding machine. There is no longer any need for careful control when applying the known ones
Schutzanordnungen, wie erwähnt, erforderlich ist. Es versteht sich auch bei der soeben beschriebenen Weiterbildung, daß die innere Kontaktschicht und die äußere Kontaktschicht jeweils ein elektrisch zumindest schwach leitfähiges Textilband sein können. Auch bevorzugt ist es, die Trennschicht zwischen der inneren Kontaktschicht und der äußeren Kontaktschicht zu be¬ festigen und somit, wie bereits angedeutet, ein Band zu er¬ halten, das zur Herstellung der Schutzanordnung lediglich noch auf das Wicklungselement aufgewickelt werden muß.Protection arrangements, as mentioned, is required. It also goes without saying in the development just described that the inner contact layer and the outer contact layer can each be an electrically at least weakly conductive textile tape. It is also preferred to fix the separating layer between the inner contact layer and the outer contact layer and thus, as already indicated, to obtain a tape which only has to be wound onto the winding element in order to produce the protective arrangement.
Im Rahmen jedweder Ausgestaltung der Erfindung enthält die Trennschicht vorzugsweise Spaltglimmerblätter, die, wie be¬ reits ausgeführt, die gewünschte Neigung zur Spaltbildung aufweisen.Within the scope of any configuration of the invention, the separating layer preferably contains mica sheets which, as already stated, have the desired tendency to form gaps.
Ebenso bevorzugt ist es, die Isolierschicht, die Trennschicht und die Kontaktschicht des Wicklungselementes so auszuführen, daß sie imprägnierbar sind, insbesondere um eine aushärtbare Harzzubereitung anbringen zu können. Eine bevorzugte Ausge¬ staltung eines solchen Wicklungselementes zeichnet sich aus durch eine Imprägnierung mit einer ausgehärteten Harzzuberei- tung, wobei die Kontaktschicht weiterhin elektrisch kontak- tierbar ist. Auf diese Weise kann die Kontaktschicht mit ei¬ nem Wicklungsträger, in den das Wicklungselement eingebaut wird, elektrisch kontaktiert werden, was ebenfalls zu einem wünschenswerten Potentialausgleich zwischen dem Wicklungsele- ment und dem Wicklungsträger beiträgt.It is also preferred to design the insulating layer, the separating layer and the contact layer of the winding element in such a way that that they can be impregnated, in particular in order to be able to apply a curable resin preparation. A preferred embodiment of such a winding element is characterized by an impregnation with a hardened resin preparation, the contact layer still being able to be electrically contacted. In this way, the contact layer can be electrically contacted with a winding support in which the winding element is installed, which also contributes to a desirable potential equalization between the winding element and the winding support.
Zur Lösung des auf einen Satz mit mehreren Wicklungselementen gerichteten Teils der Aufgabe wird ein Satz mit mehreren Wicklungselementen angegeben, wobei jedes Wicklungselement dem oben beschriebenen erfindungsgemäßen Wicklungselement entspricht und bei dem die Leiteranordnungen untereinander verschaltet sind und eine Wicklung für eine elektrische Ma¬ schine, insbesondere einen Turbogenerator, bilden.To solve the part of the task directed to a set with a plurality of winding elements, a set is specified with a plurality of winding elements, each winding element corresponding to the winding element according to the invention described above and in which the conductor arrangements are interconnected and a winding for an electrical machine, in particular one Turbo generator.
Alle oben erwähnten bevorzugten Weiterbildungen eines einzel¬ nen Wicklungselements sind ebenfalls bevorzugte Weiterbildun¬ gen der Wicklungselemente eines Satzes aus mehreren Wick¬ lungselementen.All of the preferred further developments of a single winding element mentioned above are also preferred further developments of the winding elements of a set of several winding elements.
Vorzugsweise sind alle Isolierschichten, alle Trennschichten und alle Kontaktschichten der Wicklungselemente des Satzes imprägnierbar, und sie werden insbesondere mit einer aushärt¬ baren HarzZubereitung imprägniert und diese HarzZubereitung ausgehärtet.All insulating layers, all separating layers and all contact layers of the winding elements of the set can preferably be impregnated, and in particular they are impregnated with a curable resin preparation and this resin preparation is cured.
Die Wicklungselemente des Satzes sind vorzugsweise in einem elektrisch leitfähigen Wicklungsträger angeordnet, wobei jede Kontaktschicht mit dem Wicklungsträger elektrisch kontaktiert ist. Dieser Wicklungsträger ist insbesondere ein aus einer Vielzahl dünner, ferromagnetischer Bleche gebildeter Körper. Die Bleche bestehen insbesondere aus Weicheisen oder einer im wesentlichen dieselben magnetischen Eigenschaften wie Weich- eisen aufweisenden Legierung. Die Kontaktierung der Wick¬ lungselemente mit dem Wicklungsträger führt zu einer Unter¬ drückung elektrischer Potentialdifferenzen zwischen Wick¬ lungselementen untereinander oder zwischen einem Wicklungs- element und dem Wicklungsträger und trägt somit bei zu einer weiteren Verbesserung des Schutzes der Wicklungselemente ge¬ gen eine Beschädigung durch eine ungewollt auftretende Glimm¬ entladung oder dergleichen. Weiterhin bewirken die Bleche ei¬ ne elektrische Überbrückung zwischen benachbarten selbstüber- läppenden Bahnen eines Wicklungselementes an der Außenseite. Hierdurch wird gewährleistet, daß ein Außenglimmschutzstrom überwiegend in axialer Richtung und nicht schraubenförmig um die Leiteranordnung herum fließen kann.The winding elements of the set are preferably arranged in an electrically conductive winding support, each contact layer being electrically contacted with the winding support. This winding support is in particular a body formed from a large number of thin, ferromagnetic sheets. The sheets consist in particular of soft iron or of essentially the same magnetic properties as soft iron alloy. The contacting of the winding elements with the winding carrier leads to a suppression of electrical potential differences between winding elements with one another or between a winding element and the winding carrier and thus contributes to a further improvement in the protection of the winding elements against damage from damage unwanted glow discharge or the like. Furthermore, the sheets effect an electrical bridging between adjacent self-overlapping tracks of a winding element on the outside. This ensures that an external glow protection current can flow predominantly in the axial direction and not helically around the conductor arrangement.
Ausführungsbeispiele für die Erfindung sowie weitere Hinweise im Hinblick auf eine bevorzugte Anwendung der Erfindung wer¬ den anhand der Zeichnung näher erläutert. Die Zeichnung ist teilweise leicht verzerrt und/oder schematisiert ausgeführt, um bestimmte Merkmale näher herauszustellen. Die Zeichnung ist nicht als maßstabsgerechte Darstellung eines konkreten Ausführungsbeispiels anzusehen. Die anhand der Zeichnung er¬ teilten Hinweise sind gegebenenfalls zu ergänzen in Anwendung der Kenntnisse, die dem einschlägig bewanderten Fachmann zu Gebote stehen, und der Hinweise, die sich auf den zitierten Dokumenten des Standes der Technik ergeben. Im einzelnen zei¬ gen:Exemplary embodiments of the invention and further information with regard to a preferred application of the invention are explained in more detail with reference to the drawing. The drawing is partially slightly distorted and / or schematic to emphasize certain features. The drawing is not to be regarded as a true-to-scale illustration of a specific exemplary embodiment. The information given on the basis of the drawing may have to be supplemented using the knowledge available to the person skilled in the relevant art and the information that results from the cited prior art documents. In detail:
Figur 1 einen Teil eines Querschnitts durch ein Wick¬ lungselement, das in einem Wicklungsträger ange- ordnet ist;FIG. 1 shows a part of a cross section through a winding element which is arranged in a winding support;
Figur 2 eine Außenansicht eines Wicklungselements;Figure 2 is an external view of a winding element;
Figur 3 und Figur 4 schematisierte Ansichten eines Wicklungselements; sowie Figur 5 eine schematisierte Darstellung eines Bandes, welches bei der Herstellung eines Wicklungsele¬ ments vorzugsweise Anwendung findet.Figure 3 and Figure 4 are schematic views of a winding element; such as Figure 5 is a schematic representation of a tape, which is preferably used in the manufacture of a winding element.
In den Figuren tragen einander entsprechende Elemente jeweils dasselbe Bezugszeichen. Die zu einzelnen Figuren gegebenen Erläuterungen gelten in diesem Sinne für alle Figuren der Zeichnung.Corresponding elements in the figures each have the same reference numerals. In this sense, the explanations given for individual figures apply to all figures in the drawing.
Figur l zeigt ein Wicklungselement, welches eine elektrisch leitfähige Leiteranordnung 1 aufweist, die von verschiedenen Schichten umgeben ist. Die Leiteranordnung 1 ist der Einfach¬ heit halber als homogener, metallischer Körper dargestellt. In der Praxis ist eine solche Leiteranordnung 1 allerdings weniger üblich; insbesondere dann, wenn die Leiteranordnung 1 ein Bestandteil einer Ständerwicklung einer elektrischen Ma¬ schine wie z.B. eines Turbogenerators ist, ist sie ein mehr oder weniger komplexes Gebilde aus einer Vielzahl von stab- oder bandförmigen elektrischen Leitern, von denen gegebenen- falls alle oder einige hohl sind zur Durchleitung eines flüs¬ sigen oder gasförmigen Kühlmittels. Von besonderer Bedeutung in großen elektrischen Maschinen, insbesondere Turbogenerato¬ ren, die ausgelegt sind zur Abgabe oder Aufnahme einer elek¬ trischen Leistung von 10 MW und darüber, sind Leiteranordnun- gen 1 in Form sogenannter Roebelstäbe. Bei einem Roebelstab handelt es sich um eine Anordnung mit einer Vielzahl einzel¬ ner stabförmiger elektrischer Leiter, die nach bestimmten Ge¬ sichtspunkten untereinander verflochten sind. Von einer Dar¬ stellung wird im vorliegenden Fall aus Gründen der Vereinfa- chung abgesehen.FIG. 1 shows a winding element which has an electrically conductive conductor arrangement 1 which is surrounded by different layers. For the sake of simplicity, the conductor arrangement 1 is shown as a homogeneous, metallic body. In practice, however, such a conductor arrangement 1 is less common; especially when the conductor arrangement 1 is part of a stator winding of an electrical machine, such as a turbogenerator, it is a more or less complex structure made up of a multiplicity of rod-shaped or ribbon-shaped electrical conductors, all or some of which may be hollow for the passage of a liquid or gaseous coolant. Conductor arrangements 1 in the form of so-called Roebel rods are of particular importance in large electrical machines, in particular turbogenerators which are designed to deliver or take up an electrical power of 10 MW and above. A Roebel rod is an arrangement with a large number of individual rod-shaped electrical conductors which are interwoven with one another according to certain aspects. In the present case, a representation is not used for reasons of simplification.
Die Leiteranordnung 1 ist umgeben von einer elektrisch iso¬ lierenden Isolierschicht 2. Diese Isolierschicht 2 wird übli¬ cherweise gebildet, indem die Leiteranordnung 1 mit einem im- prägnierbaren Isolierband umwickelt wird, welches als wichti¬ ge funktionelle Komponente eine Glimmerzubereitung enthält. Das auf die Leiteranordnung 1 aufgewickelte Band wird an- schließend mit einer aushärtbaren Harzzubereitung, insbeson¬ dere einem Gemisch aus einem Epoxidharz und einem Säureanhy¬ drid, getränkt und die Harzzubereitung ausgehärtet. Wie be¬ reits erwähnt, kann diese Tränkung und Aushärtung vor oder nach dem Einbau des Wicklungselements in einen entsprechend vorgesehenen Wicklungsträger erfolgen. Je nach Anwendung kann zwischen der Leiteranordnung 1 und der Isolierschicht 2 eine sogenannte Glimmschutzanordnung vorgesehen werden, die zur Vergleichmäßigung des elektrischen Potentials in der Umgebung der Leiteranordnung 1 dient. Dies ist dann besonders wich¬ tig, wenn die Leiteranordnung 1 einen komplexen inneren Auf¬ bau hat, insbesondere ein Roebelstab ist. Von der Darstellung einer Glimmschutzanordnung ist aus Gründen der Vereinfachung ebenfalls abgesehen worden.The conductor arrangement 1 is surrounded by an electrically insulating insulating layer 2. This insulating layer 2 is usually formed by wrapping the conductor arrangement 1 with an impregnable insulating tape which contains a mica preparation as an important functional component. The tape wound on the conductor arrangement 1 is finally impregnated with a curable resin preparation, in particular a mixture of an epoxy resin and an acid anhydride, and the resin preparation is cured. As already mentioned, this impregnation and curing can take place before or after the installation of the winding element in a correspondingly provided winding support. Depending on the application, a so-called glow protection arrangement can be provided between the conductor arrangement 1 and the insulating layer 2, which serves to equalize the electrical potential in the vicinity of the conductor arrangement 1. This is particularly important if the conductor arrangement 1 has a complex internal structure, in particular a Roebel rod. The illustration of a glow protection arrangement has also been left out for reasons of simplification.
Die Isolierschicht 2 des Wicklungselements ist umgeben von einer Schutzanordnung 3, 4, bestehen aus einer schraubenartig und selbstüberlappend angeordneten Trennschicht 3 sowie einer Kontaktschicht 4, die ebenfalls schraubenartig und selbst- überlappend angeordnet ist sowie die Trennschicht 3 von einer der Isolierschicht 2 zugewandten Innenseite 5 zu einer der Isolierschicht 2 abgewandten Außenseite 6 durchquert. Die Trennschicht 3 ist ausgezeichnet durch eine relativ geringe mechanische Festigkeit, so daß eine Spaltbildung, die ein- setzt, wenn das Wicklungselement mechanischen Dehnungen oder Schrumpfungen unterworfen wird, in der Trennschicht 3 konzen¬ triert wird. Die Kontaktschicht 4 ist elektrisch zumindest schwach leitfähig und hüllt die Trennschicht 3 gewissermaßen ein, so daß die Trennschicht 3 elektrostatisch abgeschirmt ist. Dadurch kann es nicht zu einer Glimmentladung in einem in der Trennschicht 3 aufgetretenen Spalt kommen. Die elek¬ trische Leitfähigkeit der Kontaktschicht 4 wird vorzugsweise der zu erwartenden Belastung des Wicklungselementes durch ma¬ gnetische Wechselfelder angepaßt. Ein die Kontaktschicht 4 durchdringendes magnetisches Wechselfeld führt nämlich dazu, daß in der Kontaktschicht 4 ein elektrischer Strom induziert wird. Ist die Leitfähigkeit der Kontaktschicht 4 relativ hoch, so muß erwartet werden, daß dieser elektrische Strom relativ hoch wird. Da der elektrische Strom ebenfalls ein Ma¬ gnetfeld erzeugt, kommt es somit in der Summe zu einer Beein¬ flussung des von außen auf die Kontaktschicht 4 einwirkenden Magnetfeldes, was unter Umständen unerwünscht sein kann. Au¬ ßerdem bewirkt der elektrische Strom unter Umständen eine Er¬ wärmung der Kontaktschicht 4, die im ungünstigsten Fall zu einer Funkenerosion oder einer thermischen Beschädigung des Wicklungselementes führen könnte. Um Nachteile, die sich aus diesen beiden Effekten ergeben können, zu vermeiden, ist da¬ her die elektrische Leitfähigkeit der Kontaktschicht 4 ent¬ sprechend zu wählen. Unter Umständen reicht eine vergleichs¬ weise schwache Leitfähigkeit, wie man sie gemäß üblichem Ver¬ ständnis von einem Halbleiter erwarten würde, zur Gewährlei- stung des gewünschten Potentialausgleichs durch die Kontakt- schicht 4 aus. Aus Figur 1 ist auch erkennbar, daß die Kon¬ taktschicht 4 ihrerseits zweiteilig aufgebaut ist. Um dies herauszustellen, sind die einzelnen Elemente des Wicklungs¬ elements nicht in unmittelbarem Kontakt, sondern leicht beab- standet zueinander dargestellt. In der Realität sind einander benachbarte Elemente selbstverständlich in engem Kontakt zu¬ einander.The insulating layer 2 of the winding element is surrounded by a protective arrangement 3, 4, consists of a screw-like and self-overlapping separating layer 3 and a contact layer 4, which is also screw-like and self-overlapping, and the separating layer 3 from an inner side 5 facing the insulating layer 2 crosses an outer side 6 facing away from the insulating layer 2. The separating layer 3 is distinguished by a relatively low mechanical strength, so that a gap formation which begins when the winding element is subjected to mechanical expansions or shrinkages is concentrated in the separating layer 3. The contact layer 4 is at least weakly electrically conductive and envelops the separating layer 3 to a certain extent, so that the separating layer 3 is electrostatically shielded. As a result, a glow discharge cannot occur in a gap that has occurred in the separating layer 3. The electrical conductivity of the contact layer 4 is preferably adapted to the expected loading of the winding element by alternating magnetic fields. A magnetic alternating field penetrating the contact layer 4 leads to the fact that an electrical current is induced in the contact layer 4. Is the conductivity of the contact layer 4 relative high, it must be expected that this electrical current will be relatively high. Since the electric current also generates a magnetic field, the magnetic field acting on the outside of the contact layer 4 is influenced in total, which may be undesirable under certain circumstances. In addition, the electrical current may cause the contact layer 4 to heat up, which in the worst case could lead to spark erosion or thermal damage to the winding element. In order to avoid disadvantages that may result from these two effects, the electrical conductivity of the contact layer 4 must therefore be selected accordingly. Under certain circumstances, a comparatively weak conductivity, as would be expected from a semiconductor according to the usual understanding, is sufficient to ensure the desired potential equalization by the contact layer 4. It can also be seen from FIG. 1 that the contact layer 4 is itself constructed in two parts. To emphasize this, the individual elements of the winding element are not shown in direct contact, but rather at a slight distance from one another. In reality, elements that are adjacent to one another are of course in close contact with one another.
Wie in Figur 1 dargestellt, und wie auch aus Figur 2 ersieht- lieh, ist die Kontaktschicht 4 zusammengesetzt aus einer auf der Innenseite 5 der Trennschicht 3 angeordneten inneren Kon¬ taktschicht 7 und einer auf der Außenseite 6 der Trennschicht 3 angeordneten äußeren Kontaktschicht 8. Zwischen einander überlappenden Teilbereichen der Trennschicht 3 liegen die in- nere Kontaktschicht 7 und die äußere Kontaktschicht 8 aufein¬ ander, kommen somit in elektrischen Kontakt zueinander und bilden demgemäß die einheitliche Kontaktschicht 4.As shown in FIG. 1, and as can also be seen from FIG. 2, the contact layer 4 is composed of an inner contact layer 7 arranged on the inside 5 of the separating layer 3 and an outer contact layer 8 arranged on the outside 6 of the separating layer 3. The inner contact layer 7 and the outer contact layer 8 lie on top of one another between overlapping partial regions of the separating layer 3, thus come into electrical contact with one another and accordingly form the uniform contact layer 4.
Das Wicklungselement ist angeordnet in einem Wicklungsträger 9, der aus einer Vielzahl aufeinanderliegender weichmagneti¬ scher Bleche 11 besteht. Insbesondere ist das Wicklungsele¬ ment angeordnet in einer in dem Wicklungsträger 9 befindli- chen Nut, und zwar zusammen mit wenigstens einem weiteren, gleichartigen Wicklungselement. Auch dies ist der Einfachheit halber nicht dargestellt; für Ausführungsbeispiele sei auf die zitierten Dokumente des Standes der Technik verwiesen. Die Bleche 11 sind in Umfangsrichtung mit der Außenseite 6 benachbarter, sich überlappender Lagen des Wicklungselementes in elektrischem Kontakt, so daß in Umfangsrichtung eine elek¬ trische Überbrückung eines an der Außenseite 6 vorliegenden Spaltes 12 zwischen den Bahnen gewährleistet ist. Hierdurch fließt ein Außenglimmschutzstrom in axialer Richtung, d.h. parallel zur Leiteranordnung 1. Ohne diese Überbrückung müßte der Außenglimmschutzstrom dem spiralförmig gewickelten Wick¬ lungselement folgend schraubenförmig um die Leiteranordnung 1 fließen.The winding element is arranged in a winding support 9, which consists of a plurality of soft magnetic sheets 11 lying one on top of the other. In particular, the winding element is arranged in a coil located in the winding carrier 9. Chen slot, together with at least one other, similar winding element. This is also not shown for the sake of simplicity; for exemplary embodiments, reference is made to the cited prior art documents. The metal sheets 11 are in electrical contact in the circumferential direction with the outer side 6 of adjacent, overlapping layers of the winding element, so that an electrical bridging of a gap 12 present on the outer side 6 between the webs is ensured in the circumferential direction. As a result, an external glow protection current flows in the axial direction, ie parallel to the conductor arrangement 1. Without this bridging, the external glow protection current would have to flow helically around the conductor arrangement 1 following the spirally wound winding element.
Die Figuren 3 und 4 zeigen schematisierte Ansichten von Wick¬ lungselementen und sollen insbesondere klarstellen, daß die aus den Figuren 1 und 2 erkennbare dichte Bewicklung des Wicklungselementes mit der Trennschicht 3 nicht erforderlich ist. Nach den Figuren 1 und 2 ist die Anordnung der Trenn¬ schicht 3 um die Isolierschicht 2 nämlich im wesentlichen zweischichtig, bis auf diejenigen Stellen, wo die Trenn¬ schicht 3 von einer Lage unmittelbar an der Isolierschicht 2 zu einer weiter außerhalb gelegenen Lage wechselt. Eine sol- ehe dichte Bewicklung hat selbstverständlich einen besonders guten Kontakt zwischen der inneren Kontaktschicht 7 und der äußeren Kontaktschicht 8 zur Folge, ist aber nicht unbedingt erforderlich. Figur 3 wiederholt im wesentlichen die Art der Bewicklung, die in den Figuren 1 und 2 dargestellt ist. Eine durchgehende schräge Linie stellt einen auf der Außenseite des Wicklungselementes erkennbaren Rand der Trennschicht 3 dar,- eine gestrichelt gezeichnete Linie stellt den Rand der Trennschicht 3 dar, der unter einer anderen Lage der Trenn¬ schicht 3 verborgen ist. Eine Klammer 10 zeigt, von welcher durchgezogenen Linie bis zu welcher gestrichelten Linie das die Trennschicht 3 bildende Band reicht. Figur 4 zeigt mit denselben Bezugszeichen und Bedeutungen wie Figur 3 eine Art der Bewicklung des Wicklungselementes, bei der die Trennschicht 3 zu zwei Dritteln außerhalb des Wick¬ lungselements und nur zu einem Drittel unterhalb einer ande¬ ren Lage der Trennschicht 3 verläuft. Gemäß Figur 4 ist das Wicklungselement daher lockerer als gemäß Figuren 1 bis 3 be¬ wickelt, was eine gewisse Materialersparnis bedeutet und un¬ ter Umständen auch eine geringere Sorgfalt bei der Herstel¬ lung erfordert.FIGS. 3 and 4 show schematic views of winding elements and are intended in particular to clarify that the dense winding of the winding element with the separating layer 3, which can be seen in FIGS. 1 and 2, is not necessary. According to FIGS. 1 and 2, the arrangement of the separating layer 3 around the insulating layer 2 is essentially two-layered, except for those points where the separating layer 3 changes from a position directly on the insulating layer 2 to a position further away. Such a tight winding naturally results in particularly good contact between the inner contact layer 7 and the outer contact layer 8, but is not absolutely necessary. Figure 3 essentially repeats the type of wrapping shown in Figures 1 and 2. A continuous oblique line represents an edge of the separating layer 3 which can be seen on the outside of the winding element, a dashed line represents the edge of the separating layer 3, which is hidden under another position of the separating layer 3. A bracket 10 shows from which solid line to which dashed line the band forming the separating layer 3 extends. FIG. 4 shows, with the same reference numerals and meanings as FIG. 3, a type of winding of the winding element in which the separating layer 3 runs two thirds outside the winding element and only one third below another layer of the separating layer 3. According to FIG. 4, the winding element is therefore wound more loosely than according to FIGS. 1 to 3, which means a certain saving in material and may also require less care during manufacture.
Figur 5 zeigt schließlich das Band aus innerer Kontaktschicht 7, Trennschicht 3 und äußerer Kontaktschicht 8, das zur Her¬ stellung der aus den Figuren 1 bis 4 erkennbaren Wicklungs¬ elemente zu verwenden wäre. Die innere Kontaktschicht 7 und die äußere Kontaktschicht 8 bestehen jeweils aus einem elek¬ trisch leitfähigen Textilband. Wie ein solches Textilband ge¬ nauer beschaffen sein kann, ist bereits erläutert worden. Die Trennschicht 3 besteht im wesentlichen aus Spaltglimmerblät¬ tern, die, wie einschlägig bekannt, relativ geringe mechani- sehe Festigkeit besitzen und relativ leicht zur Aufspaltung neigen. Diese Spaltglimmerblätter sind zwischen der inneren Kontaktschicht 7 und der äußeren Kontaktschicht 8 befestigt, insbesondere verklebt. Dieses Band ist in Anwendung einschlä¬ giger Erkenntnisse herstellbar und als Ganzes lagerbar, und seine Verarbeitung zur Herstellung des beschriebenen Wick¬ lungselements iεt unkompliziert und mit einschlägig bekannten und verfügbaren Methoden und Maschinen verarbeitbar.FIG. 5 finally shows the band of inner contact layer 7, separating layer 3 and outer contact layer 8, which would be used to produce the winding elements recognizable from FIGS. 1 to 4. The inner contact layer 7 and the outer contact layer 8 each consist of an electrically conductive textile tape. How such a textile tape can be made more precisely has already been explained. The separating layer 3 consists essentially of split mica leaves which, as is known in the art, have relatively low mechanical strength and tend to split relatively easily. These split mica sheets are fastened, in particular glued, between the inner contact layer 7 and the outer contact layer 8. This tape can be produced using relevant knowledge and can be stored as a whole, and its processing for the production of the winding element described is uncomplicated and can be processed using methods and machines which are known and available.
Das beschriebene Wicklungselement eignet sich besonders dann, wenn die üblicherweise vorgenommene Imprägnierung oder Trän¬ kung mit einer aushärtbaren HarzZubereitung erst nach dem Einbau des Wicklungselementes in einen Wicklungsträger und nach dem Verschalten des Wicklungεelements mit anderen, gleichartigen Wicklungselementen vorgenommen werden soll. Bei einer solchen Tränkung und anschließenden Aushärtung der HarzZubereitung bildet sich aus den Wicklungselementen und dem Wicklungsträger gewissermaßen ein einziger Monolith, der allerdings während seiner Herstellung und auch im Rahmen sei¬ nes bestimmungsgemäßen Betriebs gewissen mechanischen Dehnun¬ gen und Schrumpfungen ausgesetzt ist, die es erfordern, ge¬ wisse Freiheitsgrade zum Ausgleich dieser Dehnungen und Schrumpfungen vorzusehen. Diese Freiheitsgrade müssen so be¬ schaffen sein, daß ihre Ausnutzung keinerlei Gefahr des Auf¬ tretens von Glimmentladungen und dergleichen mit sich bringt. Hierzu ist das kostengünstig und unkompliziert herstellbare erfindungsgemäße Wicklungselement besonders geeignet.The winding element described is particularly suitable when the usual impregnation or impregnation with a curable resin preparation is to be carried out only after the winding element has been installed in a winding carrier and after the winding element has been connected to other, similar winding elements. With such an impregnation and subsequent curing of the resin preparation, the winding elements and the winding carrier form a single monolith, so to speak however, it is exposed to certain mechanical expansions and shrinkages during its manufacture and also in the course of its intended operation, which require certain degrees of freedom to compensate for these expansions and shrinkages. These degrees of freedom must be such that their use does not entail any risk of glow discharges and the like occurring. The winding element according to the invention, which can be produced inexpensively and easily, is particularly suitable for this.
Ein Wicklungselement eignet sich besonders für elektrische Maschinen, wie Turbogeneratoren ab einer elektrischen Lei¬ stung von 10 MW bei einer Nennspannung von über 6 KV oder Hochspannungsmotoren ab 2 MW elektrischer Leistung bei einer Nennspannung von ca. 10 KV und darüber. A winding element is particularly suitable for electrical machines, such as turbogenerators from an electrical power of 10 MW with a nominal voltage of over 6 KV or high-voltage motors from 2 MW electrical power at a nominal voltage of approx. 10 KV and above.

Claims

Patentansprüche claims
1. Wicklungselement für eine elektrische Maschine, mit einer elektrisch leitfähigen Leiteranordnung (1) zur Leitung eines elektrischen Stromes und einer Isolierschicht (2) , welche die Leiteranordnung (1) umgibt, sowie einer die Isolierschicht (2) umgebenden Schutzanordnung (3, 4), welche SchutzanOrdnung (3, 4) eine schraubenartig angeordnete Trennschicht (3) auf¬ weist, dadurch gekennzeichnet, daß die Schutzanordnung (3, 4) eine schraubenartig und selbstuberlappend angeordnete sowie die Trennschicht (3) von einer der Isolierschicht (2) zuge¬ wandten Innenseite (5) zu einer der Isolierschicht (2) abge¬ wandten Außenseite (6) durchquerende, elektrisch zumindest schwach leitfähige Kontaktschicht (4) aufweist.1. winding element for an electrical machine, with an electrically conductive conductor arrangement (1) for conducting an electrical current and an insulating layer (2) which surrounds the conductor arrangement (1), and a protective arrangement (3, 4) surrounding the insulating layer (2) Which protective arrangement (3, 4) has a screw-like separating layer (3), characterized in that the protective arrangement (3, 4) has a screw-like and self-overlapping arrangement and the separating layer (3) from one of the insulating layers (2) facing inside (5) to an outside (6) facing away from the insulating layer (2) crossing, electrically at least weakly conductive contact layer (4).
2. Wicklungselement nach Anspruch 1, bei dem die Kontakt- schicht (4) die Trennschicht (3) sowohl an der Innenseite (5) als auch an der Außenseite (6) überdeckt.2. Winding element according to claim 1, wherein the contact layer (4) covers the separating layer (3) both on the inside (5) and on the outside (6).
3. Wicklungselement nach Anspruch 1 oder 2, bei dem die Kon¬ taktschicht (4) aus zumindeεt einem elektrisch zumindest schwach leitfähigen Textilband (7, 8) gebildet ist.3. Winding element according to claim 1 or 2, in which the contact layer (4) is formed from at least one electrically at least weakly conductive textile tape (7, 8).
4. Wicklungselement nach Anspruch 1 oder 2, bei dem die Kon- taktεchicht (4) gebildet iεt auε einer auf der Innenεeite (5) angebrachten inneren Kontaktschicht (7) sowie einer auf der Außenseite (6) angebrachten äußeren Kontaktschicht (8) , wobei jeweilige Teilbereiche der inneren Kontaktschicht (7) und der äußeren Kontaktschicht (8) zwischen einander überlappenden Teilbereichen der Trennschicht (3) miteinander elektrisch kontaktiert sind.4. Winding element according to claim 1 or 2, in which the contact layer (4) is formed from an inner contact layer (7) attached to the inside (5) and an outer contact layer (8) attached to the outside (6), whereby respective partial areas of the inner contact layer (7) and the outer contact layer (8) between overlapping partial areas of the separating layer (3) are electrically contacted.
5. Wicklungselement nach Anspruch 4, bei der die innere Kon¬ taktschicht (7) und die äußere Kontaktεchicht (8) elektrisch zumindeεt schwach leitfähige Textilbänder sind. 5. winding element according to claim 4, wherein the inner contact layer (7) and the outer contact layer (8) are electrically at least weakly conductive textile tapes.
6. Wicklungεelement nach Anεpruch 4 oder 5, bei der die Trennεchicht (3) zwiεchen der inneren Kontaktεchicht (7) und der äußeren Kontaktεchicht (8) befeεtigt ist.6. winding element according to claim 4 or 5, in which the separating layer (3) between the inner contact layer (7) and the outer contact layer (8) is attached.
7. Wicklungselement nach einem der vorhergehenden Anεprüche, bei der die Trennschicht (3) Spaltglimmerblätter enthält.7. Winding element according to one of the preceding claims, in which the separating layer (3) contains split mica sheets.
8. Wicklungselement nach einem der vorhergehenden Ansprüche, bei dem die Isolierschicht (2) die Trennschicht {3) und die Kontaktschicht (4) imprägnierbar sind.8. Winding element according to one of the preceding claims, in which the insulating layer (2), the separating layer {3) and the contact layer (4) can be impregnated.
9. Wicklungselement nach Anspruch 8, bei dem die Isolier¬ schicht (2) , die Trennschicht (3) und die Kontaktschicht (4) mit einer ausgehärteten Harzzubereitung imprägniert sind und bei dem die Kontaktschicht (4) elektrisch kontaktierbar iεt.9. Winding element according to claim 8, in which the insulating layer (2), the separating layer (3) and the contact layer (4) are impregnated with a hardened resin preparation and in which the contact layer (4) is electrically contactable.
10. Wicklungεelement nach einem der vorhergehenden Anεprüche, welcheε von einem elektriεch leitfähigen Wicklungεträger (9) in Umfangεrichtung umgeben und elektrisch kontaktiert ist.10. Winding element according to one of the preceding claims, which is surrounded in the circumferential direction by an electrically conductive winding carrier (9) and is electrically contacted.
11. Satz mit mehreren Wicklungselementen nach einem der vor¬ hergehenden Ansprüche, bei dem die Leiteranordnungen (1) un¬ tereinander verεchaltet εind und eine Wicklung für eine elek¬ triεche Maεchine, inεbeεondere einen Turbogenerator, bilden.11. Set with several winding elements according to one of the preceding claims, in which the conductor arrangements (1) are interconnected and form a winding for an electrical machine, in particular a turbogenerator.
12. Satz nach Anspruch 11, bei dem alle Isolierschichten (2), alle Trennschichten (3) und alle Kontaktschichten (4) impräg¬ nierbar sind.12. Set according to claim 11, in which all insulating layers (2), all separating layers (3) and all contact layers (4) are impregnable.
13. Satz nach Anεpruch 12, bei dem alle Iεolierεchichten (2), alle Trennεchichten (3) und alle Kontaktεchichten (4) mit ei¬ ner auεgehärteten Harzzubereitung imprägniert εind.13th sentence according to Claim 12, in which all the insulating layers (2), all the separating layers (3) and all the contact layers (4) are impregnated with a hardened resin preparation.
14. Satz nach einem der Anεprüche 11 biε 13, deεsen Wick- lungselemente in einem elektriεch leitfähigen Wicklungεträger (9) angeordnet εind, wobei jede Kontaktεchicht (4) mit dem Wicklungεträger (9) elektriεch kontaktiert iεt. 14. Set according to one of claims 11 to 13, whose winding elements are arranged in an electrically conductive winding support (9), each contact layer (4) being electrically contacted with the winding support (9).
EP96923821A 1995-07-18 1996-07-09 Winding element for an electrical machine Expired - Lifetime EP0839402B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19526198 1995-07-18
DE19526198 1995-07-18
PCT/DE1996/001239 WO1997004515A1 (en) 1995-07-18 1996-07-09 Winding element for an electrical machine

Publications (2)

Publication Number Publication Date
EP0839402A1 true EP0839402A1 (en) 1998-05-06
EP0839402B1 EP0839402B1 (en) 1999-04-21

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EP (1) EP0839402B1 (en)
JP (1) JP3647467B2 (en)
AT (1) ATE179288T1 (en)
DE (1) DE59601727D1 (en)
ES (1) ES2133974T3 (en)
WO (1) WO1997004515A1 (en)

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US6228494B1 (en) * 1998-12-02 2001-05-08 Siemens Westinghouse Power Corporation Method to reduce partial discharge in high voltage stator coil's roebel filler
CN1338141A (en) * 1999-01-18 2002-02-27 西门子公司 Electrical conductor, turbogenerator and method for producing a corona shiled for an electrical conductor
JP4913551B2 (en) 2006-11-07 2012-04-11 株式会社日立製作所 Rotating electrical machine winding, rotating electrical machine, and semiconductive insulating substrate used therefor
US10062481B2 (en) 2015-07-27 2018-08-28 General Electric Company Electrical conductor insulation system and method of fabrication

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Publication number Priority date Publication date Assignee Title
JPS5765239A (en) * 1980-10-09 1982-04-20 Hitachi Ltd Stator coil for rotaty electric machihe
JPS62123936A (en) * 1985-10-30 1987-06-05 Hitachi Ltd Electric field relaxation layer for coil for rotary electric machine
JPH0744798B2 (en) * 1989-07-10 1995-05-15 シーメンス アクチエンゲゼルシヤフト Conductor winding device for large rotating electric machine
CZ284036B6 (en) * 1991-09-13 1998-07-15 Siemens Aktiengesellschaft Impregnable arrangement of a supporting body and winding elements

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* Cited by examiner, † Cited by third party
Title
See references of WO9704515A1 *

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JP3647467B2 (en) 2005-05-11
JPH11509399A (en) 1999-08-17
WO1997004515A1 (en) 1997-02-06
EP0839402B1 (en) 1999-04-21
DE59601727D1 (en) 1999-05-27
ATE179288T1 (en) 1999-05-15
ES2133974T3 (en) 1999-09-16

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